Electromagnetic relay



Jan. 5 1926. 1,568,760

T. G. MARTIN ELECTROMAGNETI C RELAY Filed Dec. 9. 1920 DUEL [2U Patented Jan. 5, 1926 UNITED STATES PATENT OFFICE.

TALBOT G. MARTIN, OF CHICAQO, ILLINOIS,- ASSIGNOR TO AUTOMATIC ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ELECTROMAGNETEC RELAY.

Application filed December 9, 1920. Serial No. 429,547.

To all whom it may concern:

Be it known that I, TALBOT G. MAR'riN, a citizen of the United Statesof America, and a resident of Chicago, CookCounty, and State of lllinois have invented certain new and useful Improvements in Electromagnetic Relays, of which the following is a specification.

The present invention relates in general to electro-magnetic relays but more particularly to such relays" as are known as gang or multiple contact relays, and the object of the invention may be stated to be, specifically, the provision. of a multiple contact relay of improved design that is rugged in construction, permanent in adjustment, and economical to manufacture.

The construction of the improved relay will be fully described hereinafter, reference bein had to the accompanying drawings, of w ich Fig. 1 is a side elevation, with one of the relay coils drawn in dotted lines to expose the parts behind it, while Fig. 2 is a similar view from the other side with some of the parts cut away to more clearly show the construction. Fig. 3 is a detailed view of certain of the contacts.

Referring nowto the drawings, the relay comprises two coils 3 and 4 which are fas- 16 and 17. The

tened by means of two screws to yoke 9. Yoke 9 is fastened by means of two other screws ,to thevframe 2. The armature 15, most clearly seen in Fig. 2, is pivoted to yoke 10 by two pointed p1vot screws 7 and 8 which fit into two holes in armature 15. The yoke 10 is secured to yoke 9 by means of two screws as is clearly seen in the drawings. Insulated alike from each other and from armature 15 and mounted on the. latter are two thin plates 5 (Fig. 1) and'6 (Fig. 2) which are made of springy material. The plates 5 and 6'and their insulation are clamped tightly on opposite sides of armature 15 between the two clamping pieces 11 and 12 by means of screws plates 5 and 6 have a num-- ber of radially extending projections, as the drawings clearly show, whose function is tomake electrical contact with the contacts such as 31 and 32 (Fig. 1)- and 41 and 42 (Fig. 2) secured to the frame 2, whenever the armature 15 is attracted by coils 3 and 4. The afore-mentioned contacts are insulated from each other and from the frame and are arranged in two semiplates are clamped tightly together betweenclamping plate 1 (Fig. 1) and frame 2 by means of screws 2430, inclusive. Projection 21 of plate 5 and projection 23 of plate 6 are bent to such an extentthat they are always touching contacts 20 and 22, respectively, (see Fig. 3) and act against them as springs to keep armature 15 back against the adjustable back stopscrew 18 when the relay is not energized. All the other projections of plates 5 and 6, however are normally separated a short distance from their associated contacts.

The description of the mechanical features of the invention, having been finished, will now he succeeded by an explanation of how the relay operates.

A- suitable circuit forthe coils 3 and 4 is provided and may be closed and opened by a key, another rela yilor any wellknown or preferred means. e circuit, of course contains a source of current. When said circuit is closed the coils 3 and 4 energize and attract armature 15 which displaces plates 5 and 6 a suflicient amount so that all the projections of said plates are caused to engage with their res ctive. associated contacts. When the circu1t. for the relay is opened, coils 3 and 4 lose. their magnetism and the armature 15, propelled by the aforementioned projections of plates 5 and 6 actmg as springs against contacts'20 and 22 moves back to its original position against the back-stop screw 18.

(fine special case in which the present invention is well adapted to function will now be briefly explained. It is often desirable in an automatic telephone exchange to make a large number of trunks brsy at the same time This is accomplished, as iswell known, by grounding the private conductors of the respective trunks. We may wire the private conductors of fifty trunks to the fifty contacts of the relay shown in the present disclosure, excluding contacts 20 and 22, which contacts will be connected to ground. Now when. the, relay u n the closure of its circuit, ound is. p aced upon eachand every one o the fifty private conductors wired to the .contacts thereof, thus making the fifty trunks busy.

. Having described in invention, what I consider to be" new an desire to have protected by Letters Patent will be pointed out in the ap ended claims.

thereto, and electro-magnetically controlled means for simultaneously bringing all said movable contacts into electrical contact with saidstationary contacts.

'2. 'In an 'electro-magnetic relay, a plurality of grou s of fixed contacts, each of said contacts eing insulated fromall the rest, a plurality of groups of independently flexible movable contacts, each group of said movable contacts being punched from a single sheet of material and left attached thereto, and electro-magnetically controlled means for simultaneously bringing all said movable contacts into electrical contact with said fixed contacts.

3. In an electro-magnetic relay, a plurality of fixed contacts arranged in an arcuate row, a resilient'member having a plurality of radially extending projections adapted to engage said fixedcontacts, one of said projections being normally in engagement with one of said fixed contacts and serving as a spring to maintain the other projections out of engagement with said contacts, and

an armature for operating said member to cause all of said ot er pro ections to engage their associated fixed contacts.

contacts in the associated. row, a magnet,-

and a single armature for operating all said members to cause all said. projections to simultaneously engage their associated fixed contacts.

5. In an electro-magnetic relay, a bank of fixed contacts, and a contact plate having a plurality of fingers, one for each corre-' sponding fixed contact, one of said fingers continuously engaging its corresponding fixed. contact to maintain the remaining contacts disengaged, and an armature for operating said contact plate to overcome the tension of-the continuously engaged finger to cause the remainder of said contacts to also become engaged.

6. An electromagnetic relay having a semi-circular row of fixed contacts, a semicircular ,row of movable contacts, an armature for bringing certain of said movable contacts into engagement with said fixed contacts in pairs when the relay is energized, other of saidcontacts normally preventing the said certain contacts from engaging the-fixed contacts, and a single adjusting means for simultaneously varying the distance between said rows of contacts.

Signed by me at Chicago, Cook County, Illinois thisth day of December, 1920.

TALBOT G. MARTIN. 

